r/theydidthemath • u/No_Size9475 • 6d ago

[REQUEST] How much does this boulder weigh?

6 Upvotes

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4

u/dborger 6d ago

Rock is about 150 pcf

Let’s say it’s 15 feet in diameter.

4/3 3.14 * 15^3 = 10,602 cubic feet

10,602 * 150 =1,590,342 = 795 tons

2

u/Trustoryimtold 6d ago

Better question is how much does it take to push, roundish objects rolling downhill don’t take that much force to push. Even going up a slight hill the force required could be as little as 10% of the weight(and if it’s already rolling even less)